INTERMEDIATE REGIME OF LIGHT-DIFFRACTION BY ULTRASOUND IN CUBIC-CRYSTALS

The solution of the diffraction problem is obtained which describes fe atures of the Raman-Nath diffraction and the intermediate regime of di ffraction in cubic crystals. The dependence of energy and polarization characteristics of diffracted waves on the polarization azimuth phi o f the incident light is found. It is shown that one can choose phi and the sound frequency in a way providing the diffraction regime in whic h the intensity of diffracted optical radiation is independent of the deviation of ultrasound power in a wide range of power variation. It i s found that certain powers of the sound field can provide considerabl e changes in polarization of light in the second diffraction order.